How To Clean Outside Windows

How-to tips

Nature throws a lot at the outside of your windows — rain, dirt, pollen, etc. — leaving you with a terrible view. When you want to see clearly again, the best way to clean windows and other exterior glass around the house is with CLR® Calcium, Lime & Rust Remover.

Addressing Hard Water Stains on Exterior Glass

Hard water stains, often appearing as white, cloudy spots, can be particularly stubborn. Here's how to tackle them:

Identify the Stains: Hard water stains are typically caused by minerals like calcium and magnesium. They might appear as chalky white residue.

Using CLR Calcium, Lime & Rust Remover: This product is especially effective against hard water stains. Apply it directly to the stains, let it sit for a couple of minutes, then scrub gently with a soft brush or sponge.

Prevention: Installing a water softener system can help reduce future hard water stain issues. Alternatively, ensure exterior glass surfaces are dried quickly after getting wet to reduce stain formation.


  1. Mix CLR Calcium, Lime & Rust Remover with water in a clean bucket (50/50 mixture)
  2. Scrub the glass with a clean, damp sponge
  3. Wait 2 minutes
  4. Rinse with cold water
Always read label instructions before use.

Removing Paint, Adhesives, and Residue:

To tackle paint, adhesives, or residue on exterior glass, carefully scrape excess material with a plastic scraper. Apply acetone to a cloth and gently rub the area, testing on a small spot first. Afterward, clean the glass with your solution and rinse.

Addressing Screens and Frames:

For screens, remove and brush off debris. Clean aluminum frames with CLR® OUTDOOR FURNITURE CLEANER . For wood frames, use a damp cloth sparingly. Reattach screens and clean with water and mild detergent. This ensures a complete, polished appearance.

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